Question

Question 1: Using a low pass filter, you would have seen a rhythmic fluctuation of the baseline at 50 cycles/ second due to:

Select one:

1. Interference from the electrical supply
2. The low frequency vibration of the building
3. Noise picked up from the fluorescent lights
4. The low frequency vibration of the air conditioning
5. The noise from the chatter of other students

Question 2: The neuron's membrane potential has the ability to integrate its inputs over time. This can be done via,

Select one:

1. Adaptation and accommodation
2. Reduced refractory period effects
3. Spatial adaptation and axon hillock integration
4. Increased activity of the Na+/K+ pump
5. Spatial and temporal summation

Question 3:An individual neuron can signal changes in the stimulus strength by:

Select one:

1. Modulating the refractory periods down only
2. Modulating the refractory periods up only
3. Varying the interval between the Aps within limits of refractory periods
4. Modulating the refectory periods up or down
5. Summing up the number of active neurons

Question 4: Spike rate adaptation is due to:

Select one:

1. A reduction in the strength of a stimulus being applied
2. Changes in the relative refractory period with continued stimulation
3. An increase in the strength of the stimulus being applied
4. Many factors including effects due to ion channels adapting when a constant stimulus is applied for long
5. Changes in the absolute refractory period with continued stimulation

Answer 1

1. A low pass filter allows signals with a frequency that is lower than the selected cut-off frequency to pass through it. Low pass filters are used to direct low frequencies to higher ones or to reduce a high frequency noise to extremely low one. Since low pass filters can block high frequencies, the correct option is -

a] interference from power supply.

2. The nerve cells have numerous projections called dendrites, coming out of the cyton[ the cellular part of nerve fibers].They are designed to combine and integrate information received from the other nerve fibers. They get connections from many other neurons and combine the signals from them. So, the correct option is -

c] spacial adaptation and axon hilock integration

3. Option- [d] modulating the refractory periods up and down.

Depolarization of a neuron depends on the signal intensity in the compound action potential.

4. Spike frequency adaptation is the reduction of a neuron's firing rate to a stimulus of constant intensity. So the correct option is -

b] changes in the relative refractory period with continued stimulation.